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HIV vaccine takes different tack to boosting immune response

Researchers at Baylor College of Medicine (BCM) in Houston have reason to believe their unorthodox vaccine could one day help to prevent or control HIV infection, according to a study published in today's edition of Public Library of Science Medicine.

The study in mice boosted the immune response by removing the host's natural immune "brake." By unleashing the immune system's full potential in conjunction with conventional antiretroviral treatment, HIV could be treated more effectively or prevented altogether.

"A lot of vaccines work very well in dealing with some pathogens, but for HIV, the natural immune response usually fails," said Dr. Si-Yi Chen, associate professor at the Center for Cell and Gene Therapy at BCM and senior author of the study. "The natural immune regulator may not allow the immune system to respond to HIV infection strongly enough. So by relieving the 'brake,' we can hopefully overcome what is failing in the natural anti-HIV immune response."

In the study, funded by the National Institutes of Health, Chen and colleagues examined a molecule, SOCS1, which regulates how antigens are handled by dendritic cells, specialized white blood cells that activate the immune system.

The researchers previously found that dendritic cells in which the SOCS1 was turned off were more efficient at stimulating the body's immune cells.

Most immunization attempts to stimulate an immune response to HIV in the past have been disappointing, but Chen says his laboratory results hold promise to make current HIV vaccines work better. SOCS1 was found to be part of a pathway that not only controls the production of compounds (cytokines) that stimulate inflammation but also plays a critical role in regulating the potency of anti-HIV immune response. Dendritic cells in which SOSC1 was switched off were able to induce an effective long-term memory immune response to HIV.

"In mice, we were pretty consistent in activating anti-HIV i
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Source:Baylor College of Medicine


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